Agreement between magnetic resonance imaging, myelography, and surgery for detecting recurrent, thoracolumbar intervertebral disc extrusion in dogs

2013 ◽  
Vol 26 (01) ◽  
pp. 12-18 ◽  
Author(s):  
B. A. Brisson ◽  
S. G. Nykamp ◽  
D. Reynolds
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intervertebral Disc ◽  
Interobserver Agreement ◽  
Surgical Decompression ◽  
Diagnostic Methods ◽  
Resonance Imaging ◽  
Disc Disease ◽  
Recurrent Lesion ◽  
Magnetic Resonance Imaging Mri

Summary Objectives: Although magnetic resonance imaging (MRI) is reported to be superior to myelography to determine the location and site of first time disc herniation, comparison of these diagnostic methods in cases of recurrent intervertebral disc disease (IVD) herniation after a first surgery has not been evaluated. The objective was to compare the diagnostic accuracy of MRI and myelography in a series of dogs undergoing repeat surgical decompression for recurrent IVD extrusion when compared to the gold standard of surgery. Methods: Ten dogs with recurrent IVD herniation underwent MRI and myelography followed by surgical decompression. Three observers reviewed the images to determine the site and side of the first surgery and the recurrent lesion. Agreement was determined by calculating a kappa (κ) score. Results: Substantial interobserver agreement was noted for recurrent lesion site using MRI and myelography (κ = 0.77 vs. 0.73) and when comparing MRI and myelography to the reported surgical site (κ = 0.73 vs. 0.67). Interobserver agreement was greater with MRI for circumferential location compared to myelography (κ = 0.76 vs. 0.43), similar to what was found when comparing to surgical side (κ = 0.82 vs. 0.49). The previous surgical site in this study had no effect on ability to identify the new lesion. Clinical significance: Despite the limitations of MRI, there was greater agreement between observers using MRI for both the recurrent and first lesion.

scholarly journals Interobserver agreement for detecting Hill-Sachs lesions on magnetic resonance imaging

2021 ◽  
Vol 24 (2) ◽  
pp. 98-105
Author(s):  
Hassanin Alkaduhimi ◽  
Aïmane Saarig ◽  
Ihsan Amajjar ◽  
Just A. van der Linde ◽  
Marieke F. van Wier ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Interobserver Agreement ◽  
Interobserver Reliability ◽  
Patient Characteristics ◽  
Accurate Diagnosis ◽  
Bonferroni Correction ◽  
Resonance Imaging ◽  
Similar Appearance ◽  
Magnetic Resonance Imaging Mri

Background: Our aim is to determine the interobserver reliability for surgeons to detect Hill-Sachs lesions on magnetic resonance imaging (MRI), the certainty of judgement, and the effects of surgeon characteristics on agreement. Methods: Twenty-nine patients with Hill-Sachs lesions or other lesions with a similar appearance on MRIs were presented to 20 surgeons without any patient characteristics. The surgeons answered questions on the presence of Hill-Sachs lesions and the certainty of diagnosis. Interobserver agreement was assessed using the Fleiss’ kappa (κ) and percentage of agreement. Agreement between surgeons was compared using a technique similar to the pairwise t-test for means, based on large-sample linear approximation of Fleiss' kappa, with Bonferroni correction. Results: The agreement between surgeons in detecting Hill-Sachs lesions on MRI was fair (69% agreement; κ, 0.304; p<0.001). In 84% of the cases, surgeons were certain or highly certain about the presence of a Hill-Sachs lesion. Conclusions: Although surgeons reported high levels of certainty for their ability to detect Hill-Sachs lesions, there was only a fair amount of agreement between surgeons in detecting Hill-Sachs lesions on MRI. This indicates that clear criteria for defining Hill-Sachs lesions are lacking, which hampers accurate diagnosis and can compromise treatment.

scholarly journals ‘Benign Thoracic Pain’ Syndrome: Role of Magnetic Resonance Imaging in the Detection and Localization of Thoracic Disc Disease

1989 ◽  
Vol 82 (2) ◽  
pp. 81-83 ◽  
Author(s):  
F E Bruckner ◽  
A Greco ◽  
A W L Leung
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intervertebral Disc ◽  
Thoracic Spine ◽  
Imaging Modality ◽  
Pain Syndrome ◽  
Resonance Imaging ◽  
Disc Disease ◽  
Thoracic Pain ◽  
Thoracic Disc

The syndrome of ‘benign thoracic pain’ is seen in young women who have pain and tenderness in the mid-thoracic spine radiating around the chest and aggravated by spinal movement. Ten consecutive patients with this syndrome and 15 controls were evaluated with magnetic resonance imaging (MRI). This showed thoracic intervertebral disc dehydration with no associated prolapse in 90% of the patients and 13% of the controls. We postulate that the clinical features are due to impaired shock absorption of these degenerate discs rather than direct compression of surrounding structures. MRI is non-invasive and does not use ionizing radiation; it allows direct visualization of the entire thoracic spine and cord, and accurate detection of early disc degeneration. Thus, it is the imaging modality of choice for defining the subtle intervertebral disc abnormalities that characterize the ‘benign thoracic pain’ syndrome.

scholarly journals Adrenal radiology diagnostics – modern review

2021 ◽  
Vol 25 (2) ◽  
pp. 21-41
Author(s):  
A. V. Arablinskiy ◽  
V. D. Rumer
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Contrast Enhancement ◽  
Diagnostic Methods ◽  
Resonance Imaging ◽  
Fundamental Knowledge ◽  
Different Types ◽  
Magnetic Resonance Imaging Mri ◽  
Clinical Cases

In this article we would like to discuss the issues of adrenal pathology and its diagnostics. This is a complex review according to modern sources, fundamental knowledge and author’s experience. All clinical cases are original and morphologically verified. There are different types of classifications with different features, showed in this article. The most useful diagnostic methods are computed tomography (CT) and magnetic resonance imaging (MRI) with special contrast enhancement protocols, described in article.

Pathological findings in low-field magnetic resonance imaging of the canine spine – a study of 112 patients

2017 ◽  
Vol 20 (2) ◽  
pp. 285-291
Author(s):  
P. Holak ◽  
J. Głodek ◽  
M. Mieszkowska ◽  
M. Jałyński ◽  
Y. Zhalniarovich ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intervertebral Disc ◽  
Contrast Medium ◽  
Spin Echo ◽  
Pathological Changes ◽  
Resonance Imaging ◽  
Intervertebral Disc Disease ◽  
Disc Disease ◽  
Low Field

Abstract Magnetic resonance imaging (MRI) is a method of choice in diagnosing nervous system disorders. This paper presents the results of a study where selected segments of the canine spine were examined by low-field MRI in 112 patients. Images of pathological changes were obtained in spin echo (SE), fast spin echo (FSE) and hybrid contrast enhancement (3D HYCE) sequences. The cervical region of the spinal cord (C1-C5) was examined in 32 patients, the cervicothoracic region (C6-Th2)- in 14 patients, the thoracolumbar region (Th3-L3) – in 23 patients, and the lumbosacral region (L4-S3) – in 43 patients. The results were used to determine the incidence of pathological changes in different sections of the canine spine, such as intervertebral disc disease (IDD), disc desiccation, syringomyelia and changes characterized by higher uptake of the contrast medium. Intervertebral disc disease was diagnosed in 52.7% of patients and it was the most common abnormality. Disc dehydratation without protrusion or extrusion was noted in 23.2% of animals. Pathological changes with increased uptake of the contrast medium and indicative of neoplastic growth were observed in 13.4% of patients and syringomyelia was diagnosed in 9.82% of the examined animals. The proposed sequences revealed the presence of above abnormalities.

scholarly journals Flexor Hallucis Longus Hypertrophy Secondary to Achilles Tendon Tendinopathy: An MRI-based Case-Control Study

2020 ◽  
Author(s):  
Stephan Wirth ◽  
Octavian Andronic ◽  
Fabian Aregger ◽  
Anna Jungwirth-Weinberger ◽  
Thorsten Jentzsch ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Achilles Tendon ◽  
Interobserver Agreement ◽  
Achilles Tendinopathy ◽  
Triceps Surae ◽  
Flexor Hallucis Longus ◽  
Resonance Imaging ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

Abstract Background: The purpose of this study was to outline indirect signs of advanced Achilles tendinopathy on magnetic resonance imaging (MRI) and develop a potential tool that could aid in surgical decision-making.Methods: Magnetic resonance imaging (MRI) scans of Achilles tendon were analyzed retrospectively in two consecutive cohorts. Control group consisted of patients that had an MRI due to other reasons and no signs of tendinopathy. Two parameters from two muscle bellies were measured and compared on axial MRI scans 4 to 5 cm above the ankle joint line at the level of greatest thickness: area and diameter of the triceps surae (TS) and of the flexor hallucis longus (FHL). Interobserver agreement was analyzed. A receiver operating characteristic (ROC) curve was created for both quotients to assess potential cut-off points.Results: A total of 60 patients for each study group were included. The ratios for area and for diameter showed significant higher values for FHL in the tendinopathy group (p<0.001). There was strong to very strong interobserver agreement (rho=0.744). A diameter ratio FHL/TS of 2.0 or higher had a sensitivity of 49% and specificity of 90% for concomitant Achilles tendinopathy.Conclusion: In our patient cohort, flexor hallucis longus hypertrophy was observed even before a tendon transfer was employed as a possible compensatory mechanism for Achilles tendon tendinopathy. Using the tool described in this study, measuring a value of 2.0 or higher on an axial MRI, may be indicative as an indirect sign of functional deterioration of the Achilles tendon.

Skeletal Manifestations of Heritable Disproportionate Dwarfism in Cats as Determined by Radiography and Magnetic Resonance Imaging

2021 ◽  
Author(s):  
Lisa M. Anderson ◽  
Derek B. Fox ◽  
Kari L. Chesney ◽  
Joan R. Coates ◽  
Bryan T. Torres ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intervertebral Disc ◽  
Sagittal Plane ◽  
Frontal Plane ◽  
Intervertebral Discs ◽  
Resonance Imaging ◽  
Disc Disease ◽  
Joint Orientation ◽  
Cross Sectional

Abstract Objective The aim of this study was to characterize the radiographic alignment of thoracic and pelvic limbs and evaluate for intervertebral disc disease in cats with feline disproportionate dwarfism (FDD). Study Design Observational cross-sectional study. Radiographic joint orientation angles were measured in 10 thoracic and pelvic limbs from 5 FDD cats and compared with those angles measured in 24 thoracic limbs and 100 pelvic limbs from skeletally normal cats. Magnetic resonance imaging of the spine was performed in 2 FDD cats for the evaluation of pathology of the intervertebral discs or vertebrae. Results All limbs from FDD cats possessed deformities. FDD humeri demonstrated procurvatum proximally, and recurvatum distally in the sagittal plane, but showed no difference in the frontal plane. FDD radii possessed excessive recurvatum proximally, and procurvatum distally in the sagittal plane, and varus proximally and valgus distally in the frontal plane. Whereas no torsion was discernible in the humeri, all radii had external torsion. In the frontal plane, FDD femurs exhibited varus both proximally and distally whereas the tibia possessed proximal valgus and distal varus. No torsion in the pelvic limbs was observed. No spinal pathology was detected in the FDD cats included in the original study. Conclusion Feline disproportionate dwarfism results in significant appendicular deformity in all limbs. The incidence of intervertebral disc degeneration in FDD cats is inconclusive.

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